This prestashop module gives each merchant possibility to create custom content blocks on product page. You can define many blocks with custom content on each available product page position.
Module is easy to install and easy in use. It's worth to mention that module uses extended tinyMCE editor (also in prestashop 1.6)
This prestashop addon gives you possibility to increase usability of each product page. It's because this plugin allows to use all available hooks on product page:
productFooter, productTab, productTabContents, productActions, extraLeft, extraRight, productOutOfStock.
more informations about module you can find here: